In Fla, you can keep natives if you get them in a legal manner. And you have a current fishing license.
If it were only that easy... Check with fish and wildlife.
Commercial fishing license ( & proof your a commercial fisherman ).
Tax certificate.
Permits ( different permits to catch or obtain vs keep different species ).
Justifiable reason for this venture. (research / educational / commercial and proof of intensions)(backed by institute / university / corporation ).
Proper facilities ( large enogh to accomodate species you are caring for and their food stuffs ) and facility inspections ( including log books and other recordkeeping )
before you stock any fish ( inspections are at their leasure, 30-90 days for first pre-inspection and don't get anything wrong or you may start over (their descretion) ).
If facilities are outdoors and of appreciable size ( depending on your local zoning codes )proper permits for the facility ( including drainage ) from your local building commission / zoning board.
Educational backgroud ( proof of fish husbandtry / vetinary skills ).
Security of facility ( so no one can get in and drown ).
Approved method of capture and proof of same.
Name(s) of procurement facilities (if you will be purchasing specimens ).
That's most of it, it gets complicated after that.